Pickup truck box cover exterior surface



FIG. 1 is a top plan view of a pickup truck box cover exterior surface showing my new design;

FIG. 2 is a right side elevational view thereof, the left side elevation being a mirror image of the right side elevation;

FIG. 3 is a rear elevational view thereof;

FIG. 4 is a front elevational view thereof; and,

FIG. 5 is a perspective view thereof with broken lines indicating adjacent portions of a truck box and a truck cab being for illustrative purposes only and forming no part of the claimed design. 

The ornamental design for a pickup truck box cover exterior surface, as shown and described. 